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https://issues.apache.org/jira/browse/MATH-911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved MATH-911.
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Resolution: Won't Fix
> Remove usage of "DerivativeStructure" in the "optimization" package
> -------------------------------------------------------------------
>
> Key: MATH-911
> URL: https://issues.apache.org/jira/browse/MATH-911
> Project: Commons Math
> Issue Type: Task
> Reporter: Gilles
> Priority: Minor
> Fix For: 3.1
>
>
> The "DerivativeStructure" class is not the proper interface towards user
> applications that deal with optimization problems.
> Recent changes implies copying between e.g. the user's representation of a
> Jacobian and the "DerviativeStructure" representation of the same data. And,
> actually, the current implementation of "AbstractLeastSquaresOptimizer"
> copies back the "DerviativeStructure" representation into a "double[][]" for
> internal use.
> [~kberlin] pointed out the potential storage inefficiencies in large-scale
> problems.
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